Ahmed Sayed Kamel Ouda
@hbrc.edu.eg
Housing and Building National Research Center (HBRC)
Housing and Building National Research Center (HBRC)
RESEARCH, TEACHING, or OTHER INTERESTS
Inorganic Chemistry
25
Scopus Publications
947
Scholar Citations
14
Scholar h-index
16
Scholar i10-index
Scopus Publications
- Novel approach to enhance the efficiency of mortar against radiations by co-incorporation of lead and boron compounds with calcium chloride
Hussein Al-kroom, Ahmed S. Ouda, Wageeh Ramadan, Mahmoud Gharieb, Mudar Hamsho, and Hamdy A. Abdel-Gawwad
Springer Science and Business Media LLC
AbstractFabrication of heavy density mortar using aggregates reinforced with available solid inorganic chemical additives is of a great importance as a protective layer to mitigate radiations in nuclear facilities. The effect of lead oxide and borax decahydrate on the hydration kinetics was evaluated by determining setting time, leachability and compressive strength. To speed up the reaction, 0.5% calcium chloride was added to all formulations, and then the results were compared to their blank counterparts. Once, the optimal compositions were explored, another batch of mortar were designed to increase efficiency against radioactive sources with different photon energies. After 28 days, bulk density, linear attenuation coefficient, half-value layer, tenth-value layer, and mean-free path in the field of 137Cs and51Co were considered. Similarly, macroscopic effective removal cross-section was evaluated using radioactive source-239Pu-α-9Be. According to the previous literature, adding 0.2% PbO to cement is the optimal ratio without affecting hydration kinetics and phase composition. The study explored that, co-incorporation of PbO with 0.5% CaCl2 increases the ratio to 2.5%, while enhancing physico-mechanical and radiological characteristics against radioactive sources. Also, formulation incorporating 0.5% borax with 0.5% CaCl2 had superior attenuation against neutrons compared to other competitors. - Effect of ceramic tile waste addition on the performance of slag-based geopolymer upon exposure to marine conditions: Physico-mechanical characteristics, and shielding proficiency against ionizing radiation
A.M. Abdelmonem, Abdelhalim Azam, Abdalziz Alruwaili, Ahmed S. Ouda, and Mohamed Abd Elrahman
Elsevier BV - Photocatalytic performance of Nb<inf>2</inf>O<inf>5</inf>-graphene heterojunction for the degradation of methylene blue
Abdulhadi Hamad Al-Marri, Ali Moulahi, Amal T. Mogharbel, Amal M. Al-Mohaimeed, Fatma Janene, Ahmed S. Ouda, Eida S. Al-Farraj, Musaad N. Almaslamani, Mohamed A. Almaslamani, and Issam Mjejri
Elsevier BV - Effect of activator type and Pozzocrete waste on the mechanical and microstructural properties of eco-friendly geopolymer incorporating electric arc furnace slag
Ahmed S. Ouda, Alaa M. Rashad, and Mahmoud Gharieb
Informa UK Limited - Evaluating the role of feldspar on the resistivity of alkali-activated slag towards seawater attack
Ahmed S. Ouda and Mahmoud Gharieb
Springer Science and Business Media LLC - An investigation on the performance of lightweight mortar-based geopolymer containing high-volume LECA aggregate against high temperatures
Ahmed S. Ouda and Alaa M. Rashad
Springer Science and Business Media LLC - Effect of high temperature on physical, mechanical and microstructure properties of alkali-activated slag pastes blended with ceramic waste material
Ahmed S. Ouda
Informa UK Limited
Abstract This paper presents the influence of ceramic waste powder (CWP) inclusion on the physico-mechanical properties and microstructure analysis of alkali-activated pastes prior and after exposure to elevated temperatures. Such geopolymer specimens were designed upon replacing ground granulated blast-furnace slag (GGBFS) with CWP at ratios of 0%, 5%, 10%, 15% and 20%, by mass. The water absorption and compressive strength (wet and dry) of non-exposed samples were determined at curing ages of 1, 7, 14 and 28 days. After that, the specimens were exposed to high temperatures of 200, 400, 600 and 1000 °C with a heating rate of 5 °C/min. The characteristics of tested samples such as visual inspection, residual compressive strength and microstructure were evaluated. Techniques as Fourier Transform Infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA/DTG) and Scanning Electron Microscopy (SEM) were used for studying molecular and microstructure of geopolymer composite. Results indicated that the inclusion of CWP with slag in composite structure based geopolymer enhanced the physico-mechanical properties and microstructure of mixtures before and after thermal exposure. The specimens made of 15% CWP displayed superior thermal stability in terms of remaining compressive strength and microstructure than the reference ones. - Effect of tidal zone and seawater attack on high-volume fly ash pastes enhanced with metakaolin and quartz powder in the marine environment
Alaa M. Rashad and Ahmed S. Ouda
Elsevier BV - Behavior of alkali-activated pozzocrete-fly ash paste modified with ceramic tile waste against elevated temperatures and seawater attacks
Ahmed S. Ouda and Mahmoud Gharieb
Elsevier BV - Development the properties of brick geopolymer pastes using concrete waste incorporating dolomite aggregate
Ahmed S. Ouda and Mahmoud Gharieb
Elsevier BV - Effect of Concrete Waste on Compressive Strength and Microstructure Development of Ceramic Geopolymer Pastes
Ahmed S. Ouda and Khaled L. Abdel-Aal
Informa UK Limited
ABSTRACT Ceramic industry generates a large amount of wastes, which pollutes and damages the environment. This paper presents the effects of concrete waste incorporating dolomite aggregate on ceramic-based geopolymer pastes in terms of microstructure and compressive strength. Recently, attention has been drawn to the use of geopolymer technology in the production of building units. Geopolymers were prepared from alkali activation of ceramic waste by 6%, 8%, 10% and 12% NaOH. To enhance the mechanical properties, alkali-activated ceramic geopolymer with 10% and 12% NaOH was partially substituted with concrete waste containing dolomite coarse aggregate at proportions of 5%, 10%, 15%, 20% and 30% by weight. Likewise, other geopolymer mixtures were manufactured by replacing ceramics with 5%, 10%, 15%, 20% and 30% calcined concrete waste at 850oC. Water/binder ratio as well as compressive strength of all mixtures was determined at 1, 7, 14 and 28 days. Phase composition and microstructure of geopolymer were identified using Fourier transform infrared spectroscopy and scanning electron microscopy techniques. Incorporation of 10% concrete waste and 20% calcined concrete waste enhanced the compressive strength and the microstructure of ceramic geopolymer pastes, while embedding extra amounts led to adverse effects. GRAPHICAL ABSTRACT - Thermal resistance of alkali-activated metakaolin pastes containing nano-silica particles
Alaa M. Rashad and Ahmed S. Ouda
Springer Science and Business Media LLC - Assessing the physical, mechanical properties, and γ-ray attenuation of heavy density concrete for radiation shielding purposes
Ahmed S. Ouda and Hakim S. Abdelgader
Informa UK Limited
Abstract The main purpose of this research is to improve the shielding of gamma rays by developing special concrete with high physico-mechanical properties using local aggregates. Various concrete mixtures are designed using heavy fine aggregate as a substitute for normal fine aggregate at rates of 20, 40, 60, 80, and 100%, by weight. Other concrete mixtures have been designed by replacing coarse aggregate with 50 and 60% of heavy fine aggregate. The properties such as density, compressive strength, and tensile strength of hardened mixtures were studied. Gamma ray attenuation has been studied on concrete mixtures after exposure to utilized radiation source comprised 137Cs radioactive element with photon energy of 0.662 MeV. From the results, we concluded that the density and compressive strength in addition to the linear attenuation coefficient of hardened mixtures increased with the ratio of replacing normal aggregate with heavy aggregate up to 60%. With an increase of the ratio more than 60%, compressive strength and tensile strength were reduced with the continued increase in density. On the other hand, density and the linear attenuation coefficient increased with the replacement of coarse aggregate by 50 and 60% of the heavy fine aggregate; while both compressive strength and tensile strength decreased. - Behavior of alkali-activated metakaolin pastes blended with quartz powder exposed to seawater attack
Alaa M. Rashad, Ahmed S. Ouda, and Dina M. Sadek
American Society of Civil Engineers (ASCE)
AbstractThe purpose of this work is to investigate the resistance of alkali-activated metakaolin (AAMK) paste specimens blended with different amounts of quartz powder (QP) against different enviro... - Study of Radioactive Characteristics of Cement Pastes Blended with GGBFS
Ahmed S. Ouda
Springer International Publishing - The effect of replacing sand by iron slag on physical, mechanical and radiological properties of cement mortar
Ahmed S. Ouda and Hamdy A. Abdel-Gawwad
Informa UK Limited - Estimation of radiation properties of high-performance concrete for use in nuclear installations
Ahmed S. Ouda
American Society of Civil Engineers (ASCE)
AbstractThe objective of the study is to investigate the suitability of some concrete components for producing high-performance heavy-density concrete that could afford radiation shielding during service in Egyptian nuclear power plants. The author surveyed the Egyptian deserts for ensuring the existence and defining the locations of the special types of natural ores for the coarse aggregates that are known to be used for radiation-shielding concrete. The study introduces industrial air-cooled slag as an innovative substitute for such types of natural concrete aggregates. In addition, new chemical additives are presented for enhancing the attenuation properties of concrete against the affecting radiation in a nuclear power plant. - An investigation on alkali-activated fly ash pastes modified with quartz powder subjected to elevated temperatures
Alaa M. Rashad and Ahmed S. Ouda
Elsevier BV - Preparation and characterization of one-part non-Portland cement
H.A. Abdel Gawwad, S. Abd El-Aleem, and A.S. Ouda
Elsevier BV - Development of high-performance heavy density concrete using different aggregates for gamma-ray shielding
Ahmed S. Ouda
Informa UK Limited - The effect of replacing sand by iron slag on physical, mechanical and radiological properties of cement mortar
Ahmed S. Ouda and Hamdy A. Gawwad
Inderscience Publishers - Physico-mechanical properties of high performance concrete using different aggregates in presence of silica fume
Salah A. Abo-El-Enein, Hamdy A. El-Sayed, Ali H. Ali, Yasser T. Mohammed, Hisham M. Khater, and Ahmed S. Ouda
Informa UK Limited
RECENT SCHOLAR PUBLICATIONS
- Effect of ceramic tile waste addition on the performance of slag-based geopolymer upon exposure to marine conditions: Physico-mechanical characteristics, and shielding
AM Abdelmonem, A Azam, A Alruwaili, AS Ouda, M Abd Elrahman
Sustainable Chemistry and Pharmacy 43, 101886 2025 - Novel approach to enhance the efficiency of mortar against radiations by co-incorporation of lead and boron compounds with calcium chloride
H Al-Kroom, AS Ouda, W Ramadan, M Gharieb, M Hamsho, ...
Scientific Reports 15 (1), 929 2025 - Insights into the physico-mechanical characteristics and corrosion behavior of high-performance heavy density concrete used in the construction of electro-nuclear power facilities
AS Ouda
Construction and Building Materials 443, 137838 2024 - Effect of activator type and Pozzocrete waste on the mechanical and microstructural properties of eco-friendly geopolymer incorporating electric arc furnace slag
AS Ouda, AM Rashad, M Gharieb
Geosystem Engineering 27 (4), 171-185 2024 - Evaluating the role of feldspar on the resistivity of alkali-activated slag towards seawater attack
AS Ouda, M Gharieb
Environmental Science and Pollution Research 30 (1), 127-144 2023 - Effect of high temperature on physical, mechanical and microstructure properties of alkali-activated slag pastes blended with ceramic waste material
AS Ouda
European Journal of Environmental and Civil Engineering 26 (10), 4827-4846 2022 - An investigation on the performance of lightweight mortar-based geopolymer containing high-volume LECA aggregate against high temperatures
AS Ouda, AM Rashad
Environmental Science and Pollution Research 29 (18), 26631-26647 2022 - Effect of tidal zone and seawater attack on high-volume fly ash pastes enhanced with metakaolin and quartz powder in the marine environment
AM Rashad, AS Ouda
Microporous and Mesoporous Materials 324, 111261 2021 - Behavior of alkali-activated pozzocrete-fly ash paste modified with ceramic tile waste against elevated temperatures and seawater attacks
AS Ouda, M Gharieb
Construction and Building Materials 285, 122866 2021 - A preliminary investigation on gamma-rayattenuation of alkali-activated concrete waste based-geopolymer modified with pozzocrete-fly ash
AS Ouda
Progress in Nuclear Energy 134, 103681 2021 - Effect of Superplasticizer Dosage on Compressive Strength and Microstructure of High Volume Basic-Oxygen Slag Mortar Exposed to Sea Water Attacks
AS Ouda
Journal of Civil Engineering and Construction 10 (1), 11-20 2021 - Development the properties of brick geopolymer pastes using concrete waste incorporating dolomite aggregate
AS Ouda, M Gharieb
Journal of Building Engineering 27, 100919 2020 - Effect of concrete waste on compressive strength and microstructure development of ceramic geopolymer pastes
AS Ouda, KL Abdel-Aal
Transactions of the Indian Ceramic Society 78 (3), 146-154 2019 - Thermal resistance of alkali-activated metakaolin pastes containing nano-silica particles
AM Rashad, AS Ouda
Journal of Thermal Analysis and Calorimetry 136, 609-620 2019 - Assessing the physical, mechanical properties, and γ-ray attenuation of heavy density concrete for radiation shielding purposes
AS Ouda, HS Abdelgader
Geosystem Engineering 22 (2), 72-80 2019 - Evaluation of Superplasticized Mortars Containing High Volume Basic-Oxygen Slag Fine Aggregate Replacing Sand against Sea Water Attack
AS Ouda
Journal of Advanced Research in Applied Mechanics 61 (1), 1-12 2019 - Behavior of alkali-activated metakaolin pastes blended with quartz powder exposed to seawater attack
AM Rashad, AS Ouda, DM Sadek
Journal of Materials in Civil Engineering 30 (8), 04018159 2018 - Study of Radioactive Characteristics of Cement Pastes Blended with GGBFS
AS Ouda
Materials for Sustainable Infrastructure: Proceedings of the 1st GeoMEast 2018 - The effect of replacing sand by iron slag on physical, mechanical and radiological properties of cement mortar
AS Ouda, HA Abdel-Gawwad
HBRC journal 13 (3), 255-261 2017 - Estimation of radiation properties of high-performance concrete for use in nuclear installations
AS Ouda
Journal of Materials in Civil Engineering 28 (11), 04016121 2016
MOST CITED SCHOLAR PUBLICATIONS
- Development of high-performance heavy density concrete using different aggregates for gamma-ray shielding
AS Ouda
HBRC journal 11 (3), 328-338 2015
Citations: 342 - Preparation and characterization of one-part non-Portland cement
HAA Gawwad, S Abd El-Aleem, AS Ouda
Ceramics International 42 (1), 220-228 2016
Citations: 79 - The effect of replacing sand by iron slag on physical, mechanical and radiological properties of cement mortar
AS Ouda, HA Abdel-Gawwad
HBRC journal 13 (3), 255-261 2017
Citations: 74 - Development the properties of brick geopolymer pastes using concrete waste incorporating dolomite aggregate
AS Ouda, M Gharieb
Journal of Building Engineering 27, 100919 2020
Citations: 67 - Physico-mechanical properties of high performance concrete using different aggregates in presence of silica fume
SA Abo-El-Enein, HA El-Sayed, AH Ali, YT Mohammed, HM Khater, ...
HBRC Journal 10 (1), 43-48 2014
Citations: 65 - An investigation on alkali-activated fly ash pastes modified with quartz powder subjected to elevated temperatures
AM Rashad, AS Ouda
Construction and Building Materials 122, 417-425 2016
Citations: 47 - Behavior of alkali-activated metakaolin pastes blended with quartz powder exposed to seawater attack
AM Rashad, AS Ouda, DM Sadek
Journal of Materials in Civil Engineering 30 (8), 04018159 2018
Citations: 43 - Thermal resistance of alkali-activated metakaolin pastes containing nano-silica particles
AM Rashad, AS Ouda
Journal of Thermal Analysis and Calorimetry 136, 609-620 2019
Citations: 41 - Effect of tidal zone and seawater attack on high-volume fly ash pastes enhanced with metakaolin and quartz powder in the marine environment
AM Rashad, AS Ouda
Microporous and Mesoporous Materials 324, 111261 2021
Citations: 33 - Assessing the physical, mechanical properties, and γ-ray attenuation of heavy density concrete for radiation shielding purposes
AS Ouda, HS Abdelgader
Geosystem Engineering 22 (2), 72-80 2019
Citations: 33 - Behavior of alkali-activated pozzocrete-fly ash paste modified with ceramic tile waste against elevated temperatures and seawater attacks
AS Ouda, M Gharieb
Construction and Building Materials 285, 122866 2021
Citations: 30 - A preliminary investigation on gamma-rayattenuation of alkali-activated concrete waste based-geopolymer modified with pozzocrete-fly ash
AS Ouda
Progress in Nuclear Energy 134, 103681 2021
Citations: 25 - Effect of concrete waste on compressive strength and microstructure development of ceramic geopolymer pastes
AS Ouda, KL Abdel-Aal
Transactions of the Indian Ceramic Society 78 (3), 146-154 2019
Citations: 15 - An investigation on the performance of lightweight mortar-based geopolymer containing high-volume LECA aggregate against high temperatures
AS Ouda, AM Rashad
Environmental Science and Pollution Research 29 (18), 26631-26647 2022
Citations: 14 - Hydration characteristics of limestone filled cement pastes
AH Ali, AM Kandeel, AS Ouda
Chemistry and Materials Research 5, 68-73 2013
Citations: 14 - Estimation of radiation properties of high-performance concrete for use in nuclear installations
AS Ouda
Journal of Materials in Civil Engineering 28 (11), 04016121 2016
Citations: 11 - Evaluating the role of feldspar on the resistivity of alkali-activated slag towards seawater attack
AS Ouda, M Gharieb
Environmental Science and Pollution Research 30 (1), 127-144 2023
Citations: 5 - Effect of high temperature on physical, mechanical and microstructure properties of alkali-activated slag pastes blended with ceramic waste material
AS Ouda
European Journal of Environmental and Civil Engineering 26 (10), 4827-4846 2022
Citations: 5 - Insights into the physico-mechanical characteristics and corrosion behavior of high-performance heavy density concrete used in the construction of electro-nuclear power facilities
AS Ouda
Construction and Building Materials 443, 137838 2024
Citations: 1 - Effect of Superplasticizer Dosage on Compressive Strength and Microstructure of High Volume Basic-Oxygen Slag Mortar Exposed to Sea Water Attacks
AS Ouda
Journal of Civil Engineering and Construction 10 (1), 11-20 2021
Citations: 1